Disilane Protecting Agent for Nucleoside Functional Groups
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Solution Overview
Problem
Current methods for simultaneously protecting hydroxyl, amine, or thiol functions in organic synthesis, particularly in sugars, polyalcohols, nucleosides, and nucleic acids, are limited by the high cost and instability of existing bifunctional protecting agents, and the inability to achieve selective protection of specific positions in nucleosides.
Innovation Solution
A method involving a disilane compound with specific substituents, used in aprotic solvents at controlled temperatures, to selectively protect primary and secondary hydroxyl, amine, or thiol groups, allowing for the formation of compounds with protected pairs of functional groups, enabling selective reactions and improved usability in organic synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane is used as a protecting agent, then two hydroxyl groups can be protected simultaneously, but the protecting agent is susceptible to hydrolysis in highly basic or acidic environments and has high cost
Solution Approach 1:
The patent changes the chemical parameters of the protecting agent by replacing the disiloxane bond (-Si-O-Si-) with a silylemethylene bond (-Si-CH2-Si-). This structural modification makes the protecting agent resistant to hydrolysis in both acidic and basic environments, directly resolving the stability issue while maintaining the bifunctional protecting capability
Solution Approach 2:
The patent employs 1,2-dichloro-1,1,2,2-tetraisopropyldisilane as a cost-effective alternative to expensive existing protecting agents. The reagent can be easily synthesized from available materials, significantly reducing costs while providing equivalent or superior protecting performance
2Ease of operation
If 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane is used for protecting nucleosides, then 2'-OH position can be selectively protected, but 2',3'-protected isomer cannot be obtained in direct reaction
Solution Approach 1:
The patent creates a universal protecting agent (1,2-dichloro-1,1,2,2-tetraisopropyldisilane) that can protect various combinations of functional groups (2'-OH, 3'-OH, 5'-OH, N) in different sequences and patterns. The silylemethylene-based agent enables both stepwise and simultaneous protection strategies, providing flexibility that the disiloxane-based agent lacks
3Ease of manufacture
If di-tert-butylsilyl bis(trifluoromethanesulfonate) is used to protect hydroxyl groups, then protection can be achieved, but the reagent cost is high and conformational restrictions occur
Solution Approach 1:
The patent changes the steric parameters of the protecting group by using isopropyl groups instead of bulky tert-butyl groups. This reduction in steric bulk eliminates conformational restrictions while maintaining effective protection. The smaller isopropyl groups allow free rotation and do not impose rigid conformational constraints on the protected molecule
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the simultaneous protection of functional groups, allowing for selective reactions and improved application in organic synthesis, particularly in ribonucleosides and nucleic acid synthesis, with novel compounds that are more cost-effective and stable than previous agents.
Implementation Method 1
protecting reaction between a compound having at least two free hydroxyl, amine, or thiol groups and the disilane of formula (1)
Data Source
AI summary
The invention relates to a method of simultaneously protecting two functions which are the same or different, namely hydroxyl, amine, or thiol groups, particularly in sugars, polyalcohols, nucleosides, nucleotides, peptides, and nucleic acids and to compounds protected using this method. The method of simultaneously protecting two hydroxyl, amine, or thiol functions according to the invention is carried out by reacting the two functional groups with the disilane of formula 1, thereby forming a disilane-1,2-diyl residue, where R stands for CI or Br, or I, or a substituent of formula 2, where X1, X 2, X 3, X 4 are the same or different and are N, CH or C-R1.